These Are Guide Measurements Only
Our professional surveyor will take precise measurements during your free survey. Your measurements help us provide an initial estimate and prepare for the survey.
Measure the Width
Measure the width of your window reveal (the recess where the window sits) at three points: top, middle, and bottom. Record the smallest measurement.
Top
___ mm
Middle
___ mm
Bottom
___ mm
Use the smallest measurement as your width
Measure the Height
Measure the height of the reveal at three points: left side, centre, and right side. Again, record the smallest measurement.
Left
___ mm
Centre
___ mm
Right
___ mm
Use the smallest measurement as your height
Measure the Reveal Depth
This is the distance from the front of your existing window (the glass) to the front edge of the reveal (where the secondary glazing will sit).
Why depth matters:
- 100mm+: Optimal for maximum noise reduction
- 50-100mm: Good performance, suitable for most homes
- Under 50mm: Limited options - we may use face-fixed frames
Note Obstructions & Features
Take photos and note anything that might affect installation:
Common obstructions:
- • Window handles (measure projection)
- • Trickle vents
- • Window locks and stays
- • Radiators beneath windows
- • Curtain rails or blinds
Special features to note:
- • Bay windows (sketch the shape)
- • Arched or shaped tops
- • Stone mullions or transoms
- • Timber or uPVC reveal linings
- • Existing secondary glazing
Take Photos
Photos help us prepare for the survey and provide more accurate initial estimates.
Recommended photos:
- Full window from inside the room
- Close-up of reveal depth from the side
- Any handles, locks, or vents
- Window from outside (if accessible)
Window Measurement Template
Window #___
Location: _______________
Width (smallest): ___ mm
Height (smallest): ___ mm
Reveal depth: ___ mm
Window type: ☐ Sash ☐ Casement ☐ Other
Handle projection: ___ mm
Notes: _______________
Related Resources
Installation Process Explained
What to expect at each stage from survey to final handover.
Measurement Tutorial Video
Watch our step-by-step video guide on how to measure your windows.
Cost & Pricing Guide
How window size affects pricing and what to budget for your project.
Complete Guide to Secondary Glazing
Everything you need to know about secondary glazing systems.
Ready to Get an Accurate Quote?
Send us your measurements and photos for an initial estimate, or book a free professional survey.